What happens when high humidity levels are left unchecked in the cabin?

When high humidity levels are left unchecked in the cabin, it can lead to potential respiratory issues for passengers. Excess moisture in the air can create an environment conducive to mold and bacteria growth, which can exacerbate respiratory conditions and cause discomfort for those with allergies or asthma. High humidity may also lead to feelings of stuffiness and discomfort, making it harder for passengers to breathe easily. Ensuring proper humidity control in the cabin atmosphere is crucial not only for the comfort of passengers but also for their overall health and well-being during the flight.